Sawi no-machine



(No Model.)

J. B. ROLLINS.

SAWING MAGEINE.

Patented Deo. 9,1890.

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UNITED STATES PATENT OFFICE.

JOHN li. ROLLINS, OF CARROLLTON, KENTUCKY.

SAWlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 442,398, dated December9, 1890.

Serial No. 345,822. (No model.)

To a/ZZ whom t may concern:

Be it known that l, JOHN B. ROLLINS, a citizen of the United States,residing at Carroll ton, in the county of Carroll, State of Kentucky,have invented certain new and useful Improvements in Sawing-Machines, ofwhich the following is a specification', reference being had therein tothe accompanying drawings.

This invention relates to certain new and useful improvements insawing-machines; and it has for its object to provide mechanism 4 fortilting the stay-log for the purpose of sawing beveled boards from thepiece of timber to be sawed, making at all times boards of the samebevel and thickness.

The novelty resides in the peculiarities of construction and thecombinations, arrange ment, and adapt-ation of parts, all as more fullyhereinafter described, shown in the drawings, and then particularlypointed out in the appended claims.

The invention is clearly illustrated in the accompanying drawings,which, with the letters of reference marked thereon, form a part of thisspecification, and in which- Figure l is a vertical cross-sectionthrough portions of a saw-mill with my invention. Fig. i. is a top planwith parts in section and parts broken away, and Fig. 3 is an endelevation ot' one of the knees.

Like letters of reference indicate like parts in all the figures of thedrawings.

Referring now to the details of the drawings by letter, A designates thecarriage, B the head-blocks, C the knees, and D the staylog, of asawingmachine of known construction. The knees are adjustable on theheadblock by screwshaft a in the usual manner.

E are dogs on the stay-log l), and may be of any known or preferredform, and are de signed for holding the piece of timber F, which is tobe operated.

G is the saw-arbor arranged at right angles to the length of thestay-log and carrying the saw G.

The stay-log D pivoted to the knees by means of pivots b, so as to allowthe stay-log to be moved thereupon at right angles to its length.

.lournaled in suitable bearings c upon the top of the stay-log is theshaft H, which at its ends is provided or formed with eceentrics l,

which work in openings J, formed in the upper ends of the knees.

K is an arched segment notched upon its upper face, as shown best inFig. l, and beneath which the shaft passes. L is a lever fast upon theshaft in proximity to this segment and carrying a spring-actuated dog orpawl (l, arranged to engage the notches of said segment and hold theparts in their adj usted position. This pawl is carried by the arm e,which passes through suitable guides fon the lever, and the upper end ofthis rod is pivoted, as shown at g, to the lilik h, the upper end ofwhich is pivoted at il to the short arm j of the lever lll, as shownbest in Fig. l, said lever M being pivoted to the lever L, as at k.(Shown best in said Fig. l.)

The operation will be readily understood, and is as follows: The pieceof material F having been secured in position, as shown, the lever L isgrasped, and at the same time the lever M, which releases the pawl fromits engagement with the segment, when by turning said lever the shaft llis rotated, and by the engagement of the eccentric with the inner wallof the openings in the knees within which they are located the stay-logis caused to tilt, as indicated in Fig. l, so that as the saw comes incontact with the timber it cuts the same upon a bevel, forming a taperedslab or piece of weather-boarding, as indicated by dotted lines in Fig.l. Before the next cut the lever should be thrown into the oppositeposition, so as to tilt the stay-log, and consequently the timber F,upward. The inclination of the stay-log should be reversed after eachboard has been separated from the timber. It will of course beunderstood that the timber is to be set out the same distance for eachboard to be sawed. The operation of the eccentrics is to tilt thestay-log, so as to throw the edge of the timber to be sawed alternatelyabove and below the center of a line from a right angle from the saw tothe center of the trunnion or pivot upon which the stay-log swings onthe knees.

P is a metallic bar arranged beneath the stay-log, as shown in Fig. 1,passing through an opening in the stay-log and adapted to ex- Sio IOC

Ytend beneath the timber being sawed to support the same. Y The otherend ofAY the bar is notched upon its upper face and is engaged by a pawlP', carried by the lower end of the lever Q, which is pivoted on thelat-eral arm R on the stay-log. As each piece is sawed from the timberthis barP is moved back one or more notches, according to the thicknessof the piece removed, so as to at all times keep it out of the path ofthe saw.

What I claim as new isl. The/combination, with the knees and pivotedstay-log, of mechanism for alternately tilting the stay-log in oppositedirections, the operative lever of said mechanism being mounted on thestay-log, substantially as described.

2.Y The combination, with the knees and the stay-log pivoted thereto, ofmeans substantially as described, the operating-lever of which ismounted on the stay-log Vfor alternately tilting the stay-log inopposite directions, and means for holding the same in its adjustedposition, as set forth.

3. jl`he combination, with the knees and the stay-log pivoted thereto,of the shaft extending lengthwise of the staylog and journaled thereonand provided with eccentrics working in openings in the knees,substantial] y as specified.

4. The combination, with the knees and the stay-log therebetween andpivoted thereto at a point below its center, of the shaft extendinglengthwise of the stay-log and vjourrialed in bearings upon the upperface thereof, a lever connected with the shaft for rotating the same,and eceentrics upon the ends of the shafts, as and for the purposespecied.

5. The combination, with the knees having Vertical openings in theirupper ends, and the stay-log pivoted to and between the knees at a pointbelowl its center, of the shaft extending lengthwise thereof andjournaled in bearings on the top of the stay-log, eccentrics upon theends of said shaft working in Vand engaging the walls of the openings inthe knees, the notched segment on the stay-log, the lever fast on theshaft, and a paWl carried by the shaft and engaging the segment.,substantially as specied.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN B. ROLLINS.

IVitnesvses:

W. H. PAUL, J. XV. EASTERDAY.

